[Rails] git push not working

Hi again,

I'm working on http://ruby.railstutorial.org

section
http://ruby.railstutorial.org/ruby-on-rails-tutorial-book#sec-git_push

I'm trying to push the repository to the remote site but what ever I fials. I've updated, removed the s of the https etc but still can not push. using command

when I use command:

$ git remote add origin https://github.com/natmanu/demo_app.git  $ git push -u origin master

it then requests my email and password then returns an error.  please see attached screen shot for error.

tia
Nat

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